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Definition
| a heritable feature (color) |
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| each variant for a character (white or purple) |
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Definition
| when plants self-pollenate, all off-spring are of the same variety |
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Definition
| the crossing of two true-breeding varieties |
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Definition
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Definition
| off-spring resulting from self-pollination of F1 generation plants |
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Definition
| alternate versions of a gene |
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Definition
| the fully expressed allele in an organism's appearance |
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Definition
| has no noticeable affect on organism's appearance |
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Term
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Definition
| Mendel's 1st law; states that allele pairs separate during gamete formation and then randomly re-form as pairs during the fusion of gametes at fertilization |
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Definition
| a diagram used to predict the results of a genetic cross between individuals of a known genotype |
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Definition
| an organism having a pair of identical alleles for a character; pretaining to the gene holding that character |
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Definition
| organisms having 2 different alleles for a gene |
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Definition
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Definition
| an organism's genetic makeup |
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Definition
| the breeding of a recessive homozygote with an organism of dominant phenotype but unknown genotype |
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Definition
| an organism that is heterozygous with respect to a single gene; results from a cross between parents homozygous for differentn alleles |
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Definition
| organism heterozygous with respect to two genes; results from a cross between parents doubly homozygous for different alleles |
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Term
| law of independent assortment |
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Definition
| independent segregation of each pair of alleles during gamete formation |
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Definition
| where F1 hybrids have an appearance somewhere in between the phenotypes of the two parental varieties |
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Definition
| the phenotypes of the heterozygous and dominant homozygous are indistinguishable |
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Definition
| the two alleles affect the phenotype in separate, distinguishable ways |
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Definition
| the ablility of a gene to affect an organism in many ways |
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Definition
| a gene at a locus alters the phenotypic expression of a gene at a second locus |
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Definition
| a heritable feature in a population that varies continuously as a result of environmental influences and the additive effect of two or more genes |
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Definition
| the range of phenotypic possibilites for a single genotype; as influenced by the environment |
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Definition
| an additive effect of two or more genes on a phenotypic character |
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Definition
| many factors, both genetic and environmental, collectively influence phenotype |
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Definition
| a family tree describing the interrelationship of parents and children across the generations |
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Definition
| heterozygotes who are phenotypically normal with regard to a disorder, but can still transmit the recessive allele to their offspring |
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Definition
| common lethal genetic disease; strikes 1 out of 2500 whites of European descent |
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Definition
| a human genetic disease caused by a dysfunctional enzyme that fails to break down brain lipids of a certain class |
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Definition
| caused by the substitution of a single amino acid in the hemoglobin protein of red blood cells |
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Definition
| a degenerative disease of the nervous system; caused by a lethal dominant allele that has no phenotypic effect until the individual is 35-40 years old |
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Definition
| a technique for determining genetic abnormalities in a fetus by the presence of certain chemicals or defects |
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Term
| chorionic villus sampling (CVS) |
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Definition
| a technique in which the physician inserts a narrow tube through the cervix into the uterus and suctions out a tiny sample of fetal tissue in order to create a karotype for the fetus |
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